Small Data Transmission

1. A method comprising: receiving, by a wireless device from a first base station, a radio resource control (RRC) release message comprising a suspend configuration, wherein: the suspend configuration comprises a configuration of a small data transmission (SDT) procedure; and the configuration indicates a first radio bearer configured for the SDT procedure; based on the suspend configuration: suspending one or more radio bearers comprising: the first radio bearer configured for the SDT procedure; and a second radio bearer not configured for the SDT procedure; and transitioning to an RRC inactive state; based on initiating the SDT procedure in the RRC inactive state: resuming the first radio bearer configured for the SDT procedure; and transmitting, to a second base station, a radio resource control (RRC) resume request message; communicating, with the second base station and during the SDT procedure in the RRC inactive state, data associated with the SDT procedure; receiving, from the second base station, a second RRC release message comprising a resume indication after completion of the SDT procedure; transitioning back, based on the second RRC release message, to the RRC inactive state; initiating, in the RRC inactive state and based on the resume indication, an RRC resume procedure; transmitting, to the second base station and based on initiating the RRC resume procedure, an RRC request message; receiving, from the second base station and after transmitting the RRC resume request message, an RRC resume message; and transitioning, based on the RRC resume message, to an RRC connected state.

2. The method of claim 1, wherein the suspend configuration comprises at least one of: a resume identity; a radio access network (RAN) paging cycle; a RAN based notification area (RNA) configuration; or network hop chaining count (NCC) value.

3. The method of claim 2, wherein the RNA configuration comprises at least one of: RNA notification area information; or periodic RNA update timer value.

4. The method of claim 1, wherein the RRC resume procedure comprises a random access procedure or an RRC connection resume procedure.

5. The method of claim 1, further comprising receiving a parameter indicating a radio resource for the RRC resume procedure.

6. The method of claim 1, wherein the first base station receives, from the second base station, a partial context of the wireless device.

7. The method of claim 6, wherein the partial context is a context associated with a lower layer of the wireless device, a radio link control layer of the wireless device, a medium access control layer of the wireless device, and/or a physical layer of the wireless device.

8. A wireless device comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: receive, from a first base station, a radio resource control (RRC) release message comprising a suspend configuration, wherein: the suspend configuration comprises a configuration of a small data transmission (SDT) procedure; and the configuration indicates a first radio bearer configured for the SDT procedure; based on the suspend configuration: suspend one or more radio bearers comprising: the first radio bearer configured for the SDT procedure; and a second radio bearer not configured for the SDT procedure; and transition to an RRC inactive state; based on initiating the SDT procedure in the RRC inactive state: resume the first radio bearer configured for the SDT procedure; and transmit, to a second base station, a radio resource control (RRC) resume request message; communicate, with the second base station and during the SDT procedure in the RRC inactive state, data associated with the SDT procedure; receive, from the second base station, a second RRC release message comprising a resume indication after completion of the SDT procedure; transition back, based on the second RRC release message, to the RRC inactive state; initiate, in the RRC inactive state and based on the resume indication, an RRC resume procedure; transmit, to the second base station and based on initiating the RRC resume procedure, an RRC request message; receive, from the second base station and after transmitting the RRC resume request message, an RRC resume message; and transition, based on the RRC resume message, to an RRC connected state.

9. The wireless device of claim 8, wherein the suspend configuration comprises at least one of: a resume identity; a radio access network (RAN) paging cycle; a RAN based notification area (RNA) configuration; or network hop chaining count (NCC) value.

10. The wireless device of claim 9, wherein the RNA configuration comprises at least one of: RNA notification area information; or periodic RNA update timer value.

11. The wireless device of claim 8, wherein the RRC resume procedure comprises a random access procedure or an RRC connection resume procedure.

12. The wireless device of claim 8, wherein the instructions further cause the wireless device to receive a parameter indicating a radio resource for the RRC resume procedure.

13. The wireless device of claim 8, wherein the first base station receives, from the second base station, a partial context of the wireless device.

14. The wireless device of claim 13, wherein the partial context is a context associated with a lower layer of the wireless device, a radio link control layer of the wireless device, a medium access control layer of the wireless device, and/or a physical layer of the wireless device.

15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to: receive, from a first base station, a radio resource control (RRC) release message comprising a suspend configuration, wherein: the suspend configuration comprises a configuration of a small data transmission (SDT) procedure; and the configuration indicates a first radio bearer configured for the SDT procedure; based on the suspend configuration: suspend one or more radio bearers comprising: the first radio bearer configured for the SDT procedure; and a second radio bearer not configured for the SDT procedure; and transition to an RRC inactive state; based on initiating the SDT procedure in the RRC inactive state: resume the first radio bearer configured for the SDT procedure; and transmit, to a second base station, a radio resource control (RRC) resume request message; communicate, with the second base station and during the SDT procedure in the RRC inactive state, data associated with the SDT procedure; receive, from the second base station, a second RRC release message comprising a resume indication after completion of the SDT procedure; transition back, based on the second RRC release message, to the RRC inactive state; initiate, in the RRC inactive state and based on the resume indication, an RRC resume procedure; transmit, to the second base station and based on initiating the RRC resume procedure, an RRC request message; receive, from the second base station and after transmitting the RRC resume request message, an RRC resume message; and transition, based on the RRC resume message, to an RRC connected state.

16. The non-transitory computer-readable medium of claim 15, wherein the suspend configuration comprises at least one of: a resume identity; a radio access network (RAN) paging cycle; a RAN based notification area (RNA) configuration; or network hop chaining count (NCC) value.

17. The non-transitory computer-readable medium of claim 16, wherein the RNA configuration comprises at least one of: RNA notification area information; or periodic RNA update timer value.

18. The non-transitory computer-readable medium of claim 15, wherein the RRC resume procedure comprises a random access procedure or an RRC connection resume procedure.

19. The non-transitory computer-readable medium of claim 15, wherein the instructions further cause the wireless device to receive a parameter indicating a radio resource for the RRC resume procedure.

20. The non-transitory computer-readable medium of claim 15, wherein the first base station receives, from the second base station, a partial context of the wireless device.